Well, I'm not worried to be honest. I think way too many people allow themselves to be led by assumptions and of course prejudice against Microsoft. Please note: I'm definitely not claiming that Microsoft is that fully innocent and misunderstood IT company, heck no.
But I also don't think they deserve some of the backlash they're getting either. And I've seen this happening way too many times before. For example: I'm a vivid Minecraft player. And no, I'm not a teen (born 1970, aged 48) but I really enjoy the game nonetheless. It takes getting used to, sure, but once you do....
Alas, I'll spare you guys a rant. My point though is that Microsoft has also bought Minecraft (as you might know) and sure enough: this would spell the end for Minecraft because $Microsoft. Now... they have made some controversial changes and decisions. For example: 'Minecraft' as a name has always been a Java game. However, right now the name "Minecraft" fully refers to the previously known "Pocket Edition" ("PE") and the original is now known as "Minecraft - Java edition". Definitely some controversy there. But it also makes sense: their's more money to be made there (also through micro transactions) and there are more players on PE than on Java.
But the Java edition is still going strong today. Despite popular rants and negative rumors that it was all going to be Windows 10 ("PE") and Java would soon be dropped we're now several years away and right now the Minecraft community is anxiously looking forward to the release of "Project Aquatica", version 1.13. Said to hit the Java edition within a few weeks. Dropping Java, how?
Also... Microsoft has been here before. Codeplex. I was a member and I actually enjoyed that website. Didn't do much with it but, even so, it wasn't all too bad.
So yeah, my projects will stay put and I think it's the best thing to do: not react in panic, lets first see where this is taking us. I honestly think this could turn out into a good thing. IF you're willing to give MS a fair chance. "Best tool for the job" and all.